This short study focuses on the analysis of pulse-like ground motion recordings originating from Vrancea intermediate-depth earthquakes. A ground motion database of 94 horizontal recordings from five Vrancea earthquakes occurring in the period 1977–2004 and having peak ground velocities larger than 10 cm/s in used in this study. The analysis shows that about one-third of the selected horizontal components can be classified as pulse-like. In addition, the recordings were obtained on both soft and stiff soil sites situated at epicentral distances of up to 160 km. It was also observed that the pulse-like ground motions occur for all the earthquake magnitudes in the database. The analyses have also revealed that the difference between the pulse period of the as-recorded components and of the rotated components is of less than 5%. Finally, an empirical model for the pulse period of ground motion recordings from Vrancea intermediate-depth earthquakes is proposed.

这项简短的研究重点是分析源自Vrancea中深度地震的脉冲状地面运动记录。在这项研究中，使用了1977年至2004年发生的5场Vrancea地震的94个水平记录的地面运动数据库，其峰值地面速度大于10 cm / s。分析表明，大约三分之一的选定水平分量可以归类为脉冲状。此外，这些记录是在距震中最远距离为160 km的软土和硬土上获得的。还观察到，在数据库中所有地震震级都发生了类似脉冲的地面运动。分析还表明，所记录的分量和旋转的分量的脉冲周期之间的差小于5％。最后，